peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 122

• Manufacturer Part Number: peb20560
• Description: Dsp Oriented Pbx Controller Doc
• Manufacturer: Infineon Technologies Corporation

Semiconductor Group
destination RAM. The control word will tell the down-loading program weather to finish
loading (FFFF
the control word will contain program RAM address to jump to at the end of the
down-loading.
At the end of the down - load procedure the EPM bit must be cleared by the boot routine,
by writing to it. As a result, resuming to the normal memory mapping and the regular
control signal will be generated to the external data memory. The next instruction will be
a branch to the address, specified in the EPROM first address.
Table 2-20 EPROM/ROM Data Structure
2.7.9.5
The µP boot procedure is as follows:
• OAK boot routine: write to OCMD (mail box command register) the command “start
• µP: As a result, the µP writes the µP mail box command “start boot procedure”.
• OAK boot routine: clears the MBUSY bit
• µP: performs the command “write program memory command”.
• OAK boot routine: performs the write to the program RAM and verifies that the data
• µP: performs the next write command.
This process continues until all the code is loaded. Then, instead of a write command,
the µP issues the command: “Finish boot procedure”. As a result, the OAK boot routine
clears the MBUSY bit and branches to address 0000
Start address
Number of words
RAM address
Data to be loaded
Control word
Number of words
RAM address
Data to be loaded
Control word
Number of words
RAM address
Data to be loaded
Control word
loading program RAM”
was written correctly. Then the MBUSY is cleared.
µP Boot
H
) or to continue with the next block (0000
2-76
H
.
H
Functional Block Description
) except for the first block were
PEB 20560
2003-08